Magnetic Gear - Explore the Science

 

Best Experts & Science about Magnetic Gear

Experts:
Aiso Kohei, Akatsu Kan, Aoyama Yasuaki

IECON - A Novel Flux Switching magnetic gear for High Speed Motor System

magnetic gears achieve the system with maintenance-free, low noise and low vibration characteristics by contact-less power transformation. However, conventional magnetic gears are not suitable system for high speed motors because the mechanical strength is weak due to permanent magnets of the high speed rotor. This paper presents a novel flux switching magnetic gear for the super high speed motor. The high speed rotor of the proposed magnetic gear is constructed by only iron core. Therefore, the structure is very simple and robust and it is possible to rotate in the high speed region. Moreover, the flux switching magnetic gear realizes the high torque density by utilizing the magnetomotive force of stationary field magnets. In this paper, the performances of the proposed magnetic gear including torque density, mechanical strength, loss and efficiency are evaluated.

A Novel Flux Switching magnetic gear for High Speed Motor System

magnetic gears achieve the system with maintenance-free, low noise and low vibration characteristics by contact-less power transformation. However, conventional magnetic gears are not suitable system for high speed motors because the mechanical strength is weak due to permanent magnets of the high speed rotor. This paper presents a novel flux switching magnetic gear for the super high speed motor. The high speed rotor of the proposed magnetic gear is constructed by only iron core. Therefore, the structure is very simple and robust and it is possible to rotate in the high speed region. Moreover, the flux switching magnetic gear realizes the high torque density by utilizing the magnetomotive force of stationary field magnets. In this paper, the performances of the proposed magnetic gear including torque density, mechanical strength, loss and efficiency are evaluated.

Reluctance magnetic gear and flux switching magnetic gear for high speed motor system

In the industrial field, the drive system integrated the high speed motor and the gear is required to effectively utilize the limited space. However, mechanical gears often require their lubrication and cooling, they generate whilst noise and vibration. To overcome these problems, the magnetic gears have been expected. magnetic gears achieve the system with maintenance-free, low noise and low vibration characteristics by contact-less power transformation. However, conventional magnetic gears are not suitable system for high speed motors because the mechanical strength is weak due to permanent magnets of the high speed rotor. This paper presents a novel reluctance magnetic gear and flux switching magnetic gear for the super high speed motor. The high speed rotor of the proposed magnetic gears is constructed by only iron core. Therefore, the structure is very simple and robust and it is possible to rotate in the high speed region. Moreover, the reluctance magnetic gear realizes high efficiency compared with the conventional surface permanent magnet (SPM) magnetic gear because the magnet eddy current loss on high speed rotor is not generated. While, the flux switching magnetic gear realizes the high torque density by utilizing the magnetomotive force of stationary field magnets. In this paper, the performances of these proposed magnetic gears including torque density, the system size, loss and efficiency are evaluated.

Experts: Hao Xiu-hong

Magnetic gear with intersecting axes and straight stationary pole-pieces:

Based on the¬†magnetic¬†field modulation effect, this article presents a¬†magnetic¬†gear¬†with intersecting axes and straight stationary pole-pieces. Except for a higher utilization of permanent magnets and a greater output torque, the¬†magnetic¬†gear¬†with intersecting axes and straight stationary pole-pieces provides several advantages, such as a smaller volume, higher torque density, and lower processing cost. The¬†magnetic¬†gear¬†with intersecting axes and straight stationary pole-piece topology is herein introduced and the deduced constraints of the structural design are outlined. The transmission mechanism is demonstrated by analyzing the output torque in the middle of the air gaps. The effects of the main design parameters on the maximum static torque are evaluated using the finite element method. Based on the orthogonal experimental design and the response surface method, the optimum design results are provided. Prototype of the¬†magnetic¬†gear¬†with intersecting axes and straight stationary pole-pieces has bee…

Electromechanical integrated magnetic gear

This study proposes a new type of magnetic gear, namely, the electromechanical integrated magnetic gear, that integrates the traditional field-modulated magnetic gear, drive, and control. The topology and operating principle of the electromechanical integrated magnetic gear are described in detail in this article, and the constraints of parameter design and speed ratio of electromechanical integrated magnetic gear are presented. Moreover, magnetic field distribution is analyzed with the finite element method. Subsequently, the harmonics of the magnetic field and the electromagnetic torque are calculated. The static torques on all the components are exhibited by finite element method and torque test. The effects of the design parameters on the torques and the torque densities are discussed, and the results show that electromechanical integrated magnetic gear has a high speed ratio and can generate a high torque at low speed. The maximum torques are affected by air-gap thickness and other parameters.

Nonlinear forced vibration of electromechanical integrated magnetic gear system

A novel¬†magnetic¬†gear¬†drive, the electromechanical integrated¬†magnetic¬†gear¬†(EIMG) is proposed, in which field modulated¬†magnetic¬†gear, drive and control are integrated. EIMG can offer the larger torque at a lower speed. Considering the obvious nonlinear characteristics of the electromagnetic¬†coupling forces among components, the nonlinear differential equations with quadratic terms are founded. Forced responses of the nonlinear EIMG system are calculated and discussed when the exciting frequency is closed to the torsional modal combination frequency between the inner rotor and the outer ferromagnetic¬†pole-pieces. The results show that the strong and continuous resonance doesn’t occur, but the strong transient vibration will occur and the amplitudes of components will decrease very slowly. These will deteriorate the dynamic behaviors of EIMG system.

Experts: Man, Yong Kui

A kind of spatial angular magnetic gear transmission

gear¬†exciting is of vital importance in modern power transmission systems. But when the requirements of angular¬†gear¬†transmission are needed, the shortcomings of the current mechanical and¬†magnetic¬†gear¬†transmission are even more obvious. The traditional mechanical¬†gear¬†boxes have the construction of direct mechanical contact, whose disadvantages are low efficiency, noisy, apt to lubricate, easy to produce vibrations to be damaged and so on. And the existing¬†magnetic¬†gear¬†is coaxial which can’t meet the need of angular transmission. In this paper, the construction of a kind of spatial angular¬†magnetic¬†gear, which has no direct mechanical contact between the driven axis and load axis, is proposed. Besides, the principle of the¬†gear¬†ratio is introduced and a concrete¬†magnetic¬†gear¬†is analyzed. The results show that the range of the angle of this¬†magnetic¬†gear¬†can be very large. (2012) Trans Tech Publications, Switzerland.

Structural Optimization of a Novel Coaxial magnetic gear

Compared with the traditional mechanical gear, permanent magnetic gear has some unique advantages, such as high efficiency, noise free, zero friction, and overload protection and so on. However, its applications are always constrained due to its unstable or not smooth torque produced by this kind of magnetic gear. Based on the structure of the magnetic gear, this paper introduces a coaxial magnetic gear with a double-layer structure composition, which could provide the higher and stable or smooth torque.

Simulation Analysis of a Novel magnetic gear

Compared with mechanical gear, permanent magnetic gear has unique advantages which are high efficiency, noise free, zero friction, vibrationless, overload protection, etc. This paper introduced a novel coaxial magnetic gear with high speed radio and analyzed the efficient performance including peak torque, starting, braking, and no-loading procedures on the basis of calculating in finite element software Ansoft. The results prove that the novel magnetic gear is reasonable and efficient.

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